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Preheat oven to 375F degrees.
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Wafers:In a mixing bowl beat the butter with an electric mixer for 30 seconds.
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Add the sugar, baking soda and lime zest, beat until combined.
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Beat in the lime juice.
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Beat in as much flour as you can with the mixer, stir the rest in with a wooden spoon.
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Drop rounded teaspoons of dough 2 inches apart onto ungreased cookie sheets.
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Bake for about 10 minutes until the edges are beginning to brown.
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Remove the wafers with a spatula and transfer to a wire rack to cool.
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For Glaze:In a small bowl beat together the sugar, butter and enought lime juice to make a mixture of glazing consistency.
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Dip the tops of the wafers in the glaze.
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Set the wafers, glaze side up on the wire racks and allow to set before serving.